Previous maps that were created in the past in Item Frames change to the most current Map ever created when you return to your game.
Steps to reproduce
-Make a Map of your current location.
-Place it on the wall in Item Frame.
-Make a Map of a different region location.
-Place the new Map on the wall next to your previous map.
-Press home or standby button on your device.
-Return to your game and you will notice that both maps are now the same.
Keep in mind I did NOT upgrade any of the maps to show the pointer/cursor.